Jaswant Singh passed away, he belonged to which of the following professions?

The former Union Minister, Jaswant Singh passed away. He was born in Jasol village of Barmer district in Rajasthan in 1938. He had served as the external affairs minister, defence minister and finance minister of India, during the then Prime Minister Atal Bihari Vajpayee's Cabinet. Prior to pursuing a career in politics with the Bharatiya Janata Party (BJP), Mr Singh was an officer in the Indian Army in the 1950s and 60s.